Rope



N. E. SHERWOOD.

ROPE.

APPUCAHON FILED JUNE l3. I919.

1,331,679. Patented Feb. 24,1920.

Z f I g? Z NATHAN E. SHERWOOD, OF HIGHLAND PARK, MICHIGAN.

ROPE.

Specification of Letters Patent.

Patented Feb. 24, 1920.

Application filed June 13.1919. Serial No. 304,054.

To all whom zt'may concern:

Be it known that I, NATIIAN It. Surinnoun, a citizen of the lfnitcdStates, and residing at l-lighhmd Park, in the county ot Wayne LindState of Michigan, have inrcntrd a new and improved Rope, of which thefollowing is a specification.

The object oi the present invention is to provide a composite fiber andwire rope of greater strength for a given size and wei ht than has beenobtainable heretofore, an it consists in a rope formed from a pluralityof strands of twisted hemp, sisal or other strong fiber said strandsbeing simultaneously tightly twisted together with one or more smallwires of steel or other' ductile metal having hi h tensile strength.

In the drawings, Figure l is a side view of a short section of thefinished rope, the ends being unraveled. Fig. 2 is a diagrammat-ic sideview showing the several strands and wires that make up a single cord.Fig. 3 is a side view showing the preferred relation of the strands toone another before twisting. Fig. 4 is a similar view after the partshave been twisted. Figs. 5, (3 and 7 are sections on the lines 5-5, 6-6and 7 of Fig. 4.

It has been proposed to make sewing cord of a plurality of strands eachof which is formed of a plurality of fibres around which a wire istwisted--see U. S. patent to Briggs, $6,577. August 3, 1886. Inpractice, the wire thus placed forms a sheath for the correspondingstraiid, rather than a component part thereof, and tends to unwind whentension is applied.

According to the present invention, I take a plurality of strands 1,Fig. 2, of usual rope material (such as hemp or sisal binder twine) eachof which comprises a number of fibers twisted together, and twist saidstrands tightly together with one or more wires 2 of iron or steel orother metalhaving a high tensile strength, whereupon they assume theappearance indicated in 4. This action is to be carefully distinguishedfrom what would occur were the several strands 1 first twisted'togetherand thereafter wrapped or twisted around with a wire, even though thelatter were of the some pitch as the strands. In this latter case, thewire would always be on the outside of the strand, whereas, according tomy invention, it is at certain points on the outside, again at thecenter, anc at still other points is intermediate between the two, asindicated in F1 s. 4, 5, 6 and T. The course of the wire is ike that ofany particular fiber. of ordinar binder twine; and the practical resultis hot the wire enters with the strands to form a cord or rope whereinboth the tensile strength of the fiber and the tensile strength of themetal is eflicieiitly utilized, and in which the fiber acts as a cushionfor the wire, thereby preventing breaking under sudden jerks.

The resulting small cord or rope is preferably finally twisted withadditional cords or ropes as indicated in Fig. 1 thereby forming acompleted rope of a size suflicient to meet the particular need. F orsome purposes the single element shown in Fig. 4 will sufiice. Thenumber of strands 1 may, of course, be varied as may the number of wireswhich go to make up the corresponding cord, but it ispreferr'edto usefour strands and two wires for each cord.

I claim 1. A. cord formed of a series of strands of twisted fiber suchas hemp c" sisal twisted tightly together and simultaneo'usl with a wireof stron tensile metal twiste in with the strands o fiber so as to liearallel therewith, whereby theposition of the wire in the cord is atsome points on the outer surface of the cord and at other points isinter mediate between the center of the cord and said outer surface.

2. A rope comprising a. plurality of cords tightly twisted together,each cord including a plurality of strands of twisted fiber and one ormore small wires of strong tensile metal, twisted] in with the strandsof fiber so as to lie parallel therewith, said strands and wire or wiresbein simultaneously twisted together, and the wire or Wires being on theouter surface of the corresponding cord at some oints and being near thecenter thereof at o't or points.

NATHAN E. SHERWOOD.

